The Cadillac ELR electric vehicle with extended range, to be revealed January 15 at the North American International Auto Show, was photographed driving through the mountains of Southern California during development testing.

"Cadillac customers are going to enjoy the unique features ELR will bring to the market. We’re going to change the way people think about luxury and electrification,” said Chris Thomason, ELR chief engineer.

Essentially a production version of the Converj concept, the ELR will feature an electric motor, a lithium-ion battery and a four-cylinder engine-generator. Like the Chevrolet Volt, the ELR will operate primarily on electricity but can utilize the four-cylinder engine to boost its range when the battery is low.